These lemurs sing in rhythms like the steady tick-tick of a metronome, or the stomp-stomp-clap of Queen’s “We Will Rock You,”—a trait we thought was uniquely human
In this case, De Gregorio refers to the animals’ tendency to harmonize in duets and even choruses of more than two animals. The animals sing to find family members that have become lost, lay claim to patches of forest, and even perform “vocal battles” with their neighbors, De Gregorio says in an email.
The discovery is all the more interesting considering that, though we are both primates, the last time humans and indris shared a common ancestor, there were still dinosaurs walking the earth. Not surprisingly, eight of the features the scientists keyed in on had to do with rhythm. Specifically, music tends to lean on two-beat structures, also known as categorical rhythms. In these patterns, notes can be either the same length, creating a 1:1 ratio like the clicks of a metronome, or a 1:2 ratio where some notes are twice as long as the others., study coauthor and a biomusicologist at the Max Planck Institute for Psycholinguistics in the Netherlands.
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